I have the same machine, and 10x7 resolution works just fine. Do you have another monitor attached when changing the resolution?
** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/984135 Title: [Lenovo T420s] Resolution Failure 1024x768 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/984135/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp